When a Rasmussen poll last month showed Representative Roy Blunt opening a double-digit lead over Robin Carnahan in their Senate campaign in Missouri, John Hancock was not surprised. Mr. Hancock, a ...
S&P Dow Jones Indices is launching the S&P 500 Twitter Sentiment Index, which aims to use the Twitter API to track S&P 500 components that are trending in sentiment. The novel use of Twitter's API ...
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